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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: InstallSnapshot.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv.raft.msg;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Preconditions;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.nio.ByteBuffer;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.HashMap;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.Map;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.util.LongEncoder;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>/**<a name="line.18"></a>
<span class="sourceLineNo">019</span> * Sent from leader to follower to with a chunk of key/value pairs that will wholesale replace the follower's key/value store.<a name="line.19"></a>
<span class="sourceLineNo">020</span> */<a name="line.20"></a>
<span class="sourceLineNo">021</span>public class InstallSnapshot extends Message {<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>    private final long snapshotTerm;<a name="line.23"></a>
<span class="sourceLineNo">024</span>    private final long snapshotIndex;<a name="line.24"></a>
<span class="sourceLineNo">025</span>    private final Map&lt;String, String&gt; snapshotConfig;<a name="line.25"></a>
<span class="sourceLineNo">026</span>    private final long pairIndex;<a name="line.26"></a>
<span class="sourceLineNo">027</span>    private final boolean lastChunk;<a name="line.27"></a>
<span class="sourceLineNo">028</span>    private final ByteBuffer data;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>// Constructors<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>    /**<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * Constructor.<a name="line.33"></a>
<span class="sourceLineNo">034</span>     *<a name="line.34"></a>
<span class="sourceLineNo">035</span>     * @param clusterId cluster ID<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * @param senderId identity of sender<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * @param recipientId identity of recipient<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * @param term sender's current term<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * @param snapshotTerm term of the last log entry in the snapshot<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * @param snapshotIndex index of the last log entry in the snapshot<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * @param snapshotConfig cluster config of the last log entry in the snapshot (first {@code pairIndex} only)<a name="line.41"></a>
<span class="sourceLineNo">042</span>     * @param pairIndex index of the first key/value pair in this chunk<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * @param lastChunk true if this is the last chunk in the snapshot<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * @param data encoded key/value pairs<a name="line.44"></a>
<span class="sourceLineNo">045</span>     */<a name="line.45"></a>
<span class="sourceLineNo">046</span>    public InstallSnapshot(int clusterId, String senderId, String recipientId, long term, long snapshotTerm,<a name="line.46"></a>
<span class="sourceLineNo">047</span>      long snapshotIndex, long pairIndex, Map&lt;String, String&gt; snapshotConfig, boolean lastChunk, ByteBuffer data) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>        super(Message.INSTALL_SNAPSHOT_TYPE, clusterId, senderId, recipientId, term);<a name="line.48"></a>
<span class="sourceLineNo">049</span>        this.snapshotTerm = snapshotTerm;<a name="line.49"></a>
<span class="sourceLineNo">050</span>        this.snapshotIndex = snapshotIndex;<a name="line.50"></a>
<span class="sourceLineNo">051</span>        this.pairIndex = pairIndex;<a name="line.51"></a>
<span class="sourceLineNo">052</span>        this.snapshotConfig = snapshotConfig;<a name="line.52"></a>
<span class="sourceLineNo">053</span>        this.lastChunk = lastChunk;<a name="line.53"></a>
<span class="sourceLineNo">054</span>        this.data = data;<a name="line.54"></a>
<span class="sourceLineNo">055</span>        this.checkArguments();<a name="line.55"></a>
<span class="sourceLineNo">056</span>    }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>    InstallSnapshot(ByteBuffer buf) {<a name="line.58"></a>
<span class="sourceLineNo">059</span>        super(Message.INSTALL_SNAPSHOT_TYPE, buf);<a name="line.59"></a>
<span class="sourceLineNo">060</span>        this.snapshotTerm = LongEncoder.read(buf);<a name="line.60"></a>
<span class="sourceLineNo">061</span>        this.snapshotIndex = LongEncoder.read(buf);<a name="line.61"></a>
<span class="sourceLineNo">062</span>        this.pairIndex = LongEncoder.read(buf);<a name="line.62"></a>
<span class="sourceLineNo">063</span>        this.snapshotConfig = this.pairIndex == 0 ? InstallSnapshot.getSnapshotConfig(buf) : null;<a name="line.63"></a>
<span class="sourceLineNo">064</span>        this.lastChunk = Message.getBoolean(buf);<a name="line.64"></a>
<span class="sourceLineNo">065</span>        this.data = Message.getByteBuffer(buf);<a name="line.65"></a>
<span class="sourceLineNo">066</span>        this.checkArguments();<a name="line.66"></a>
<span class="sourceLineNo">067</span>    }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>    @Override<a name="line.69"></a>
<span class="sourceLineNo">070</span>    void checkArguments() {<a name="line.70"></a>
<span class="sourceLineNo">071</span>        super.checkArguments();<a name="line.71"></a>
<span class="sourceLineNo">072</span>        Preconditions.checkArgument(this.snapshotTerm &gt; 0);<a name="line.72"></a>
<span class="sourceLineNo">073</span>        Preconditions.checkArgument(this.snapshotIndex &gt; 0);<a name="line.73"></a>
<span class="sourceLineNo">074</span>        Preconditions.checkArgument(this.pairIndex &gt;= 0);<a name="line.74"></a>
<span class="sourceLineNo">075</span>        Preconditions.checkArgument((this.pairIndex == 0) == (this.snapshotConfig != null));<a name="line.75"></a>
<span class="sourceLineNo">076</span>        Preconditions.checkArgument(this.data != null);<a name="line.76"></a>
<span class="sourceLineNo">077</span>    }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>// Properties<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>    public long getSnapshotTerm() {<a name="line.81"></a>
<span class="sourceLineNo">082</span>        return this.snapshotTerm;<a name="line.82"></a>
<span class="sourceLineNo">083</span>    }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>    public long getSnapshotIndex() {<a name="line.85"></a>
<span class="sourceLineNo">086</span>        return this.snapshotIndex;<a name="line.86"></a>
<span class="sourceLineNo">087</span>    }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>    public Map&lt;String, String&gt; getSnapshotConfig() {<a name="line.89"></a>
<span class="sourceLineNo">090</span>        return this.snapshotConfig;<a name="line.90"></a>
<span class="sourceLineNo">091</span>    }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>    public long getPairIndex() {<a name="line.93"></a>
<span class="sourceLineNo">094</span>        return this.pairIndex;<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>    public boolean isLastChunk() {<a name="line.97"></a>
<span class="sourceLineNo">098</span>        return this.lastChunk;<a name="line.98"></a>
<span class="sourceLineNo">099</span>    }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>    public ByteBuffer getData() {<a name="line.101"></a>
<span class="sourceLineNo">102</span>        return this.data.asReadOnlyBuffer();<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>// Message<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span>    @Override<a name="line.107"></a>
<span class="sourceLineNo">108</span>    public boolean isLeaderMessage() {<a name="line.108"></a>
<span class="sourceLineNo">109</span>        return true;<a name="line.109"></a>
<span class="sourceLineNo">110</span>    }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>    @Override<a name="line.112"></a>
<span class="sourceLineNo">113</span>    public void visit(MessageSwitch handler) {<a name="line.113"></a>
<span class="sourceLineNo">114</span>        handler.caseInstallSnapshot(this);<a name="line.114"></a>
<span class="sourceLineNo">115</span>    }<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span>    @Override<a name="line.117"></a>
<span class="sourceLineNo">118</span>    public void writeTo(ByteBuffer dest) {<a name="line.118"></a>
<span class="sourceLineNo">119</span>        super.writeTo(dest);<a name="line.119"></a>
<span class="sourceLineNo">120</span>        LongEncoder.write(dest, this.snapshotTerm);<a name="line.120"></a>
<span class="sourceLineNo">121</span>        LongEncoder.write(dest, this.snapshotIndex);<a name="line.121"></a>
<span class="sourceLineNo">122</span>        LongEncoder.write(dest, this.pairIndex);<a name="line.122"></a>
<span class="sourceLineNo">123</span>        if (this.pairIndex == 0)<a name="line.123"></a>
<span class="sourceLineNo">124</span>            InstallSnapshot.putSnapshotConfig(dest, this.snapshotConfig);<a name="line.124"></a>
<span class="sourceLineNo">125</span>        Message.putBoolean(dest, this.lastChunk);<a name="line.125"></a>
<span class="sourceLineNo">126</span>        Message.putByteBuffer(dest, this.data);<a name="line.126"></a>
<span class="sourceLineNo">127</span>    }<a name="line.127"></a>
<span class="sourceLineNo">128</span><a name="line.128"></a>
<span class="sourceLineNo">129</span>    @Override<a name="line.129"></a>
<span class="sourceLineNo">130</span>    protected int calculateSize() {<a name="line.130"></a>
<span class="sourceLineNo">131</span>        return super.calculateSize()<a name="line.131"></a>
<span class="sourceLineNo">132</span>          + LongEncoder.encodeLength(this.snapshotTerm)<a name="line.132"></a>
<span class="sourceLineNo">133</span>          + LongEncoder.encodeLength(this.snapshotIndex)<a name="line.133"></a>
<span class="sourceLineNo">134</span>          + LongEncoder.encodeLength(this.pairIndex)<a name="line.134"></a>
<span class="sourceLineNo">135</span>          + (this.pairIndex == 0 ? InstallSnapshot.calculateSize(this.snapshotConfig) : 0)<a name="line.135"></a>
<span class="sourceLineNo">136</span>          + 1<a name="line.136"></a>
<span class="sourceLineNo">137</span>          + Message.calculateSize(this.data);<a name="line.137"></a>
<span class="sourceLineNo">138</span>    }<a name="line.138"></a>
<span class="sourceLineNo">139</span><a name="line.139"></a>
<span class="sourceLineNo">140</span>    private static Map&lt;String, String&gt; getSnapshotConfig(ByteBuffer buf) {<a name="line.140"></a>
<span class="sourceLineNo">141</span>        final int count = (int)LongEncoder.read(buf);<a name="line.141"></a>
<span class="sourceLineNo">142</span>        final HashMap&lt;String, String&gt; config = new HashMap&lt;&gt;(count);<a name="line.142"></a>
<span class="sourceLineNo">143</span>        for (int i = 0; i &lt; count; i++)<a name="line.143"></a>
<span class="sourceLineNo">144</span>            config.put(Message.getString(buf), Message.getString(buf));<a name="line.144"></a>
<span class="sourceLineNo">145</span>        return config;<a name="line.145"></a>
<span class="sourceLineNo">146</span>    }<a name="line.146"></a>
<span class="sourceLineNo">147</span><a name="line.147"></a>
<span class="sourceLineNo">148</span>    private static void putSnapshotConfig(ByteBuffer dest, Map&lt;String, String&gt; config) {<a name="line.148"></a>
<span class="sourceLineNo">149</span>        final int count = config.size();<a name="line.149"></a>
<span class="sourceLineNo">150</span>        LongEncoder.write(dest, count);<a name="line.150"></a>
<span class="sourceLineNo">151</span>        for (Map.Entry&lt;String, String&gt; entry : config.entrySet()) {<a name="line.151"></a>
<span class="sourceLineNo">152</span>            Message.putString(dest, entry.getKey());<a name="line.152"></a>
<span class="sourceLineNo">153</span>            Message.putString(dest, entry.getValue());<a name="line.153"></a>
<span class="sourceLineNo">154</span>        }<a name="line.154"></a>
<span class="sourceLineNo">155</span>    }<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span>    private static int calculateSize(Map&lt;String, String&gt; config) {<a name="line.157"></a>
<span class="sourceLineNo">158</span>        int total = LongEncoder.encodeLength(config.size());<a name="line.158"></a>
<span class="sourceLineNo">159</span>        for (Map.Entry&lt;String, String&gt; entry : config.entrySet())<a name="line.159"></a>
<span class="sourceLineNo">160</span>            total += Message.calculateSize(entry.getKey()) + Message.calculateSize(entry.getValue());<a name="line.160"></a>
<span class="sourceLineNo">161</span>        return total;<a name="line.161"></a>
<span class="sourceLineNo">162</span>    }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>// Object<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
<span class="sourceLineNo">166</span>    @Override<a name="line.166"></a>
<span class="sourceLineNo">167</span>    public String toString() {<a name="line.167"></a>
<span class="sourceLineNo">168</span>        return this.getClass().getSimpleName()<a name="line.168"></a>
<span class="sourceLineNo">169</span>          + "[\"" + this.getSenderId() + "\"-&gt;\"" + this.getRecipientId() + "\""<a name="line.169"></a>
<span class="sourceLineNo">170</span>          + ",clusterId=" + String.format("%08x", this.getClusterId())<a name="line.170"></a>
<span class="sourceLineNo">171</span>          + ",term=" + this.getTerm()<a name="line.171"></a>
<span class="sourceLineNo">172</span>          + ",snapshotTerm=" + this.snapshotTerm<a name="line.172"></a>
<span class="sourceLineNo">173</span>          + ",snapshotIndex=" + this.snapshotIndex<a name="line.173"></a>
<span class="sourceLineNo">174</span>          + ",pairIndex=" + this.pairIndex<a name="line.174"></a>
<span class="sourceLineNo">175</span>          + (this.snapshotConfig != null ? ",snapshotConfig=" + this.snapshotConfig : "")<a name="line.175"></a>
<span class="sourceLineNo">176</span>          + ",lastChunk=" + this.lastChunk<a name="line.176"></a>
<span class="sourceLineNo">177</span>          + ",data=" + this.describe(this.data)<a name="line.177"></a>
<span class="sourceLineNo">178</span>          + "]";<a name="line.178"></a>
<span class="sourceLineNo">179</span>    }<a name="line.179"></a>
<span class="sourceLineNo">180</span>}<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>




























































</pre>
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